The Effect Of Tillage System In Yield And Its Components Of Bread Wheat In Salahaldin Province –North Of Iraq


This study carried out in order to compare the effect of the type of tillage in some crop qualities and productivity of spring bread wheat, Triticum aestivum L. Cham 6 var. during the 2011-2012 season in field in district of Tuz - Salahaldin province north of Iraq in total area of six hectares (24 Iraqi Donum), RCBD design was used, the field was divided into three blocks included two levels of tillage, the first level was Conventional Tillage (CT) using disc plow to plowing the soil before sowing with normal seeder , second level was Zero Tillage (ZT) planting method using new ZT seeder with press wheels to compact soil on seeding row, thus we have 6 experimental units each unit area was one hectare. Except tillage methods all other factors such as fertilizer dosage( 80 kg N ha-1and 120 kg P2O5 ha-1) , weed control, supplementary irrigation , seeding rate(120 kg ha-1) sowing date( 27/11/2011) are the same. Plant height (cm), stem thickness (mm) , number of tillers m-2, , number of spikes m-2, spike length (cm) , number of grains spike-1, the weight of 1000 grains, specific (test) weight kg hectoliter-1, biological yield kg ha.-1, grain yield kg ha.-1 and straw yield kg ha.-1 traits were studied.Results showed that ZT had significance superiority in number of tillers m-2 , number of spikes m-2 , biological yield kg ha-1, grain yield kg ha-1 and straw yield kg ha-1 . traits comparing with conventional tillage, while no significant differences between the two planting methods in the other traits